Github user skamille commented on the issue:
https://github.com/apache/zookeeper/pull/136
> Per 3. This PR does not guarantee that you will see all events. I'll
double check the doc to make sure that that's clear. These watches behave
exactly as other watches in ZK other than they don't remove themselves when
triggered.
Well, I would personally expect that a watch that doesn't remove itself
when triggered is going to never drop an event so long as the session is alive.
My understanding of the raft-based stores is that they can give you the
historical change log that guarantees it won't lose events. I haven't done the
mental exercise of determining if we could do that in ZK (probably? maybe?) but
it is certainly a difference that partially arises from the underlying design
differences between the systems, and we should be more specific about what will
really happen with this feature.
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